Heater.



J. C. MORGAN.

HEATER.

APPLICATION FILED JUNE 17, 1912.

Patented Aug. 31, 1915.

Hie/2Z0? 2737 11 @wm JOSEPH C. MORGAN, F GHICAGO, ILLINOIS.

HEATER.

Specification of Letters Patent.

Patented Au 31, 1915,

Application filed J'une 17, 1912. Seriallto. 704,085.

To all whom it may concern Be it known that I, JOSEPH C. MORGAN, a

I citizen of the United States, residing at Chicago, in the county ofCook and State of Illinois, have invented certain new and usefulImprovements in Heaters, of which the following is a specification.

' My invention relates to heaters and,more

particularly, to electric liquid heaters of a portable type.

The present invention is well adapted for use by surgeons or dentists insterilizing their instruments, and for many purposes where acomparatively small body of water, oil, or a sterilizing compound isdesired to be heated quickly to a high temperature, one such use inparticular being by butchers in heating their knives in oil or waterpreparatory to cutting up meat.

As is well known, a knife immersed in hot water or oil takes ontemporarily a better cutting edge than before it was so heated.Butchers, in particular, desire to heat their knives periodically whileusing them, not only to improve the cutting edge but, also, to loosenand render fluid the heavy or congealed grease which accumulates uponthe sides of the blade, making its passage through the meat more easyand rapid.

A principal object of the present invention is to provide a portableheater well adapted for the purposes specified, which shall afi'ordmeans to accurately control the temperature of the fluid or othermaterial being heated.

Another object of the invention is to so construct and arrange the partsof the heater that heating units having different properties may beemployed in a single heater and readily interchanged, one with theother, as occasion may require.

A further object of the invention is to provide a heater wherein thereceptacle containing the material being heated may be readily removedfrom the device, so that the materials may be heated in one place andforming a part of this specification in which- Figure 1 is a centralvertical section of the improved heater; Fig. 2 is a bottom plan of thesame showing the electric switch arrangement; and Fig. 3 is adiagrammatic illustration of the heating coils.

In these drawings, 10 indicates the side of a metallic casing having abottom 11 secured by bolts 11, and a top 12. The top 12 has a circularcentral opening within which issecured a depending metallic tube 13 ofsubstantially the same outside diameter as said central opening. Thebottom of the tube may be closed by a metallic plate rigidly fastened tothe tube 13 but, in practice, I prefer to employ a fibrous andheat-resisting plate 14-. which is suitably held against the end of thetube 13 by a packing of asbestos 15', or other non-conductor of. heat,with which the space between the inner tube 13 and the outer casing isfilled.

A plug switch 20, having three recesses for the accommodation of plugsand, having the usual contact sleeves or springs well known in the art,is secured conveniently by screws 21 to the bottom of the heater asshown. A twin plug 22, being the terminal of a pair of wires 23 carryingelectric current, is formed to have its plugs a and I) enter therecesses 0 and d, respectively, or d and e, respectively, and thussupply current i to the heater. Within the heater and surrounding theinner tube 13 there is provided a thin tube or sleeve 13 of insulatingmaterial closely fitting said tube 13 and adapted to be slid uponorwithdrawn from said tube when the bottom 11 is removed from the side10. On this supplementary tube 13 are arranged two coils of resistancewire adapted to become heated by the passage of current therethrough andcommunicate heat to the casing or tube 13 and any object therein. Thewire of these coils may be of German silver or other suitable metalaffording the necessary current resistance and durability, such metalsbeing well known in the art, the various turns and coils being insulatedfrom each other. While in Fig. 1 of the drawings the two coils are shownone outside the other and separated by the tubular insulation 13 inpractice I sometimes prefer to have both coils in close proximity to thetube 13, the turns of one coil lying between turns of the other, butspaced and in- 'currents of greatly differing voltages and thus meetvarying demands merely by the ready insertion of coils of suitableproportions and Winding.

As shown in Fig. 3, the ends of the heating coils are secured to theterminals-c1. and e of the switch 20. In order that the heat supplied tothe water receptacle, hereinafter to be described, may be varied byreducing the amount of heated wire in the heater, there is provided awire 0' leading from the terminal 0 of the switch to any given point onthe heating coil, for'instance, at c at the top of the coil. It will nowbe seen that when the twin plug 22 is connected with the terminals 0 andd the current will flow only through the coil d, while if the plugs areinserted in the recesses d and 6, respectively,

the current will flow through both coils d and e and the amount of heatproduced proportionately decreased.

Within the tube 13 there is fitted a tubular receptacle 25 having aclosed b'ottom. '26 and a funnel-shaped top 27 provided with a carryingbail 28 and a tipping handle 29-. The tubular receptacle is slidablewithin the tube 13, and when the parts are operatively arrangedtelescopes within the heating unit. On the tubular portion 25 there isarranged a sliding collar 30 adjustable .upon said portion by means of athumb-screw 31, said 001-. lar acting as a stop or rest for the liquidcontainer 25. By fastening this collar higher or lower upon the tubularportion '25 the temperature of the liquid within this portion may bevaried from time to time, or for particular purposes as desired. Thedeeper this portion 25 is inserted within the heating well the hotterwill the liquid become in a.

given time. .This container is also made of sheet metal and ispreferably provided with a flat bottom so that it will stand upon asuitable fiat surface when outside the heater. The whole device issupported by metallic legs 32 riveted to the side 10.

' While there is herein illustrated and described -a preferredembodiment of these improvements, it will be evident to those skilled inthe art that some changes may be made in the arrangement andconstruction of parts without departing from the spirit or scope of theinvention.

I claim:

1. Ina heater, the combination of a casing, an electric heating elementsupported by said casing, a receptacle .telescoped within said casing,and a collar cooperating with said receptacle and casing to adj ustablysupport said receptacle in the desired position relative to said casing,whereby the effect of said heating element is varied.

2. In a heater, the combination of a casing provided with a removablebottom, an electric heating element supported by said bottom within saidcasing and removable from said casing when said bottom is removed, areceptacle telescoped within said casing, and means cooperating withsaid receptacle and casing to adjustably support said receptacle in thedesired position relative to said casing, whereby the effect of saidheating element is varied.

3. In a heater, the combination of acasing, an electric heating elementsupported by said casing comprising a plurality of resistance conductorselectrically insulated from each other, means for selectively directingcurrent through one or both of said conductors, a receptacle telescopedwithin said casing, and means cooperating with said receptacle andcasing to adj ustably hold said receptacle in the desired positionrelative to said casing, whereby the effect of said heating element isvaried.

4. In a heater, the combination of a heat insulated casing provided witha removable bottom, an electric heating element supported by said bottomwithin said casing comprising an electric insulating member and aplurality of resistance conductors disposed thereon and electricallyinsulated from each other, means for selectively directing currentthrough one or both of said conductors, a receptacle telescoped withinsaid casing, and means cooperating with said receptacle and casing toadjustably hold said re- JOSEPH O. 'MORGAN.

Witnesses:

W. R. BROWN, T. V. ARMOND.

